Voistek Mono Over the Head Call Center Handsfree Telephone RJ Headset with Noise Cancelling Microphone for 3com Aastra Alcatel-lucent NEC Office Landline Desk Phones (S10TPA10) Not sure about your phone compatibility? See part of compatible phone models listed below in Product Description. Still can't find your phone model? Just get FREE HEADSET EXPERT HELP or ADVICE by CONTACTING US. This Headset Compatible with most standard Telephone with RJ Headset port such as Aastra Avaya GE Mitel NEC Nortel Plantronics Siemens Toshiba...etc. Direct connect over the head headset with Plantronics Compatible Quick Disconnect(QD), no additional amplifiers or adapters required, most easy setup headset solution. Superior call Center quality headset, excellent sound quality, lightweight, durable and comfortable for all day use Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. Comes with a coiled quick disconnect cord PQDRJA10